obtaining a first coordinate and a second coordinate respectively corresponding to two ends of a response line to be processed from a positron emission tomography device, wherein the response line to be processed refers to a response line obtained by detecting electrons using a detector in the positron emission tomography device;

determining corresponding dimensional coordinates of the response line to be processed in a sinogram corresponding to the response line to be processed based on the first coordinate and the second coordinate; and

generating the sinogram corresponding to the response line to be processed based on the dimensional coordinates, and generating a positron emission tomography image based on the sinogram generated based on the dimensional coordinates;

wherein after said generating the sinogram corresponding to the response line to be processed based on the dimensional coordinates, the method further comprises:

performing a weighting processing on the response line generated based on the dimensional coordinates in the sinogram.